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Stephen, you coul try Geller-Grimm & Artigas's key for Leptogastrinae (http://www.geller...rinae.html), especially if you have more pictures, including the head close-ups. As far as i can see the difference between Leptogaster and Tipulogaster is in the length of flagellum compared with the combined length of scape and pedicel; you should exclude other genera, though (there's more than 3 of them...)